JERUSALEM (CNN) -- Police searched Sunday for gunmen who opened fire on an Israeli police vehicle in the West Bank, killing two officers, according to Israeli police.

The shooting took place at 8:20 p.m. (1820 GMT) on the 90 Road in the Jordan Valley, in the West Bank, police spokesman Mickey Rosenfeld told CNN.

"The police and IDF (Israel Defense Forces) are conducting a search for the attackers in the direction that they fled. They are working on an operational and intelligence level to arrest those who carried out this attack," said Rosenfeld.

An emergency vehicle found the victims, said Rosenfeld. It was not immediately clear whether the emergency vehicle was responding to a report of the incident.

Witnesses told CNN that all traffic in the area was blocked as authorities conducted their investigation.